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Bhg.com: Dogwood Tree
http://www.bhg.com/home/Dogwood-Tree.html
Collection of popular dogwood trees with pictures and cultivation information.
Dogwood Diseases
http://www.ces.ncsu.edu/depts/pp/notes/Ornamental/odin23/od23.htm
Common diseases and other problems.
How to Identify and Control Dogwood Anthracnose
http://www.na.fs.fed.us/spfo/pubs/howtos/ht_dogwd/ht_dog.htm
Symptoms and control of this disease of flowering and Pacific dogwood.
UF/IFAS: Flowering Dogwood
http://edis.ifas.ufl.edu/MG267
Includes uses, establishment and care, insects and diseases, and cultivars.
Wild About Gardening: Dogwood
http://www.wildaboutgardening.org/en/features/section5/dogwood/dogwood.htm
Describes various herbaceous species, shrubs, and small trees in the genus Cornus.